602317
1A2B3A4B5C6C 8D9C 10C
11.acd 12.abcd 13.abd 14.bd 15.ac
16.bcd 17.acd 18.abd 19.cd 20.abc
1 3 a 2 4 b
11ac 12 abc 13acd 14ab 15ac 16abd 17cd 18ac 19abc20bd
21 23 24 27 28 29 dui